rn嵌入到iOS原生应用,有相应的demo支持,而安卓确没有,感觉非亲身的。那我们就只能靠自己一步一步的爬坑吧。
1.使用android studio创建HelloRN工程
2.在工程跟目录下创建package.json。
$npm init
3.创建了node_modules目录并把react和react-native下载到了其中。
$ npm install --save react react-native@0.46.4
安装react native0.46.4
从提示中可以看到,react-native0.46.4需要react 16.0.0-alpha.12.所以我们需要安装它。
$ npm i -S react@16.0.0-alpha.12
在终端运行完成后,再来打开package.json文件。
下面我们打开新创建的package.json文件,然后在其scripts字段中加入:
"start": "node node_modules/react-native/local-cli/cli.jsstart"
package.json文件如下所示:
4.在工程根目录下创建index.android.js。添加如下代码:
import React, { Component } from 'react';
import {
AppRegistry,
Text,
} from 'react-native';
export default class HelloRN extends Component {
render() {
return (
<Text> Hello world</Text>
);
}
}
AppRegistry.registerComponent('HelloRN', () => HelloRN);
5.在你的app中build.gradle文件中添加 React Native 依赖:
compile"com.facebook.react:react-native:+"
点击sync now,如果出现
请参考stackoverflow.com/questions/37347326/errorconflict-with-dependency-com-google-code-findbugsjsr305
6.在项目的build.gradle文件中为 React Native 添加一个 maven 依赖的入口
maven {
url"$rootDir/./node_modules/react-native/android" (⚠️:这里的路径一定要保持一致,否则会出现编译报错)
}
7.在AndroidManifest.xml清单文件中声明网络权限:
<uses-permission android:name="android.permission.INTERNET">
8.添加原生代码MyReactActivity.java.
public class MyReactActivity extends Activity implements DefaultHardwareBackBtnHandler {
private ReactRootView mReactRootView;
private ReactInstanceManager mReactInstanceManager;
public static int OVERLAY_PERMISSION_REQ_CODE = 1234;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mReactRootView = new ReactRootView(this);
mReactInstanceManager = ReactInstanceManager.builder()
.setApplication(getApplication())
.setBundleAssetName("index.android.bundle")
.setJSMainModuleName("index.android")
.addPackage(new MainReactPackage())
.setUseDeveloperSupport(BuildConfig.DEBUG)
.setInitialLifecycleState(LifecycleState.RESUMED)
.build();
// 注意这里的HelloWorld必须对应“index.android.js”中的
// “AppRegistry.registerComponent()”的第一个参数
mReactRootView.startReactApplication(mReactInstanceManager, "HelloRN", null);
setContentView(mReactRootView);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!Settings.canDrawOverlays(this)) {
Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
Uri.parse("package:" + getPackageName()));
startActivityForResult(intent, OVERLAY_PERMISSION_REQ_CODE);
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == OVERLAY_PERMISSION_REQ_CODE) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!Settings.canDrawOverlays(this)) {
// SYSTEM_ALERT_WINDOW permission not granted...
}
}
}
}
@Override
public void invokeDefaultOnBackPressed() {
super.onBackPressed();
}
@Override
protected void onPause() {
super.onPause();
if (mReactInstanceManager != null) {
mReactInstanceManager.onHostPause();
}
}
@Override
protected void onResume() {
super.onResume();
if (mReactInstanceManager != null) {
mReactInstanceManager.onHostResume(this, this);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mReactInstanceManager != null) {
mReactInstanceManager.onHostDestroy();
}
}
@Override
public void onBackPressed() {
if (mReactInstanceManager != null) {
mReactInstanceManager.onBackPressed();
} else {
super.onBackPressed();
}
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_MENU && mReactInstanceManager != null) {
mReactInstanceManager.showDevOptionsDialog();
return true;
}
return super.onKeyUp(keyCode, event);
}
}
9.把MyReactActivity的主题设定为Theme.AppCompat.Light.NoActionBar
android:name=".MyReactActivity"
android:label="@string/app_name"
android:theme="@style/Theme.AppCompat.Light.NoActionBar">
10.在MainActivity中增加一个button用来点击之后跳转到rn界面。
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button)findViewById(R.id.button);
button.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button:
Intent intent = new Intent(MainActivity.this,MyReactActivity.class);
startActivity(intent);
break;
default:
break;
}
}
}
11.在工程根目录下运行$npm start
12.Android Studio中启动项目。
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